Acoustic Evaluation of Single Gutters with Different Design Configurations alongside Highways
Abstract
Environmental noise pollution is among the most urban problems which can be caused due to real sources like traffic, train and virtual sources provided by rigid surfaces. One of the urban structures in which can perform as a virtual noise source are the installed gutters alongside highways. These structures are mostly used to pass the wastewater or the rainfall. In this research, the acoustical performance of a gutter when the receivers are located on the top surface of gutter or in its shadow zone is investigated. To compute the acoustical efficiency of gutters, a 2D Boundary Element Method (BEM) is used. Investigation on the top surface of a simple gutter has shown that the total sound pressure has been changed and results in some disturbance. Various shapes have been studied to decline such disturbance. It was found that sound pressure of the model with curved basement was scattered steadier and the sound pressure for gutter models with wide basement was lower than the ones with narrow basement. Efficiency of some designed models was also compared in the shadow zone. Increase in depth and wide of gutter models either on the top or bottom surface has enhanced the performance of simple reference model. Considering the insertion loss computations, the amount of overall improvement in models with higher depths was more than widen models because of shifting effective performance toward lower frequencies.
Monazzam M R, Fard M B S.An investigation on the noise reduction performance of profiled rigid median barriers at highways. Noise and Health2011; 14(59): 135-139.
Monazzam M R, Fard, S M B.Performance of passive and reactive profiled median barriers in traffic noise reduction. J Zhejiang Uni. Sci. A (Appl. Phys & Eng) 2011; 12(1): 78-86.
Wahab M M A, Wang C, Vanegas-Useche L V, Parker G A. Experimental determination of optimum gutter brush parameters and road sweeping criteria for different types of waste. Waste Manag 2011; 31(6):1109-20.
Chew C H.The influence of inclined buildingson road traffic noise. Appl Acoust 1995;45 (1): 29-46.
Watts G R, Crombie D H, Hothersall D C. Acoustic performance of new designs of traffic noise barriers: full scale tests. J Sound Vib 1994; 177: 289–305.
Crombie DH, Hothersall DC, Chandler-Wild SN, Multiple-edge noise barrier. Appl Acoust 1995; 44(4): 353–67.
Fujiwara K,Hothersall D C, Chul-hwan K. Noise barriers with reactive surfaces. Appl Acoust 1998; 53(4):225-72.
Baulac M, Defrance J, Jean P. Optimisation with genetic algorithm of the acoustic performance of T-shaped noise barriers with a reactive top surface. Appl Acoust 2008; 69:332-42.
Duhamel D. Shape optimization of noise barriers using genetic algorithms. J Sound Vib 2006; 297: 432-43.
Baulac M, Defrance J, Jean P. Optimization of multiple edge barriers with genetic algorithms coupled with a Nelder–Mead local search. J Sound Vib 2007; 300:71–87.
Monazzam MR, Lam YW, Performance of profile single noise barriers covered with quadratic residue diffusers. Appl Acoust 2005; 66: 709-30.
Monazzam MR, Lam YW.Performance of T-shape barriers with top surface covered with absorptive quadratic residue diffusers. Appl Acoust 2008; 69: 93-109.
| Files | ||
| Issue | Vol 5 No 4 (2013) | |
| Section | Original Article(s) | |
| Published | 2015-10-11 | |
| Keywords | ||
| Total Field Insertion Loss Gutter models Boundary Element Method Barrier efficiency | ||
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